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Updated: May 3, 2025
At the age of twenty-two he invented a plough, which threw alternate furrows on either side, and two years later, a self-sharpening plough, which proved a great success. Then he turned his attention to a mechanical reaper, though his father warned him against wasting time and money on so impracticable a project.
Being rodents, they can have but two incisor teeth in each jaw, these teeth being rootless, and so set in their sockets that they are incessantly worn away in front, and as incessantly grow from the base, take the curved form of their sockets, and act much like shears which have the inestimable property of self-sharpening when blunted, and self-renewal when chipped or actually broken off by coming against any hard substance.
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